my husband..😞

So I had my husbands phone and I saw he was texting and snapping this girl constantly.... it was just constant conversation which is more than I get.. At one point he told her goodnight and callled her buttercup.. I just feel like it’s not okay but hey what do I know.. he says they are friends but I just don’t know.. I can’t be a crazy wife but it pisses me off.  Am I wrong to feel like something is wrong??